Abstract

Electrical double layer supercapacitor is very significant in the field of electrical
energy storage which can be the solution for the current revolution in the electronic
devices like mobile phones, camera flashes which needs flexible and miniaturized energy
storage device with all non-aqueous components. The multiwalled carbon nanotubes (MWNTs)
have been synthesized by catalytic chemical vapor deposition technique over hydrogen
decrepitated Mischmetal (Mm) based AB3alloy hydride. The polymer dispersed MWNTs have been obtained by insitu polymerization
and the metal oxide/MWNTs were synthesized by sol-gel method. Morphological characterizations
of polymer dispersed MWNTs have been carried out using scanning electron microscopy
(SEM), transmission electron microscopy (TEM and HRTEM). An assymetric double supercapacitor
stack has been fabricated using polymer/MWNTs and metal oxide/MWNTs coated over flexible
carbon fabric as electrodes and nafion®membrane as a solid electrolyte. Electrochemical performance of the supercapacitor
stack has been investigated using cyclic voltammetry, galvanostatic charge-discharge,
and electrochemical impedance spectroscopy.